31 
Tumors. 
Eskimo Dog cT (Canis familiaris). This dog pre- 
sented on the back over the hind quarters a large " Basal- 
celled carcinoma " arising from the sebaceous glands or 
hair follicles. This was removed by operation. The 
tumor was well circumscribed and separated from the 
underlying tissues by an apparently thickened fascia. 
The dog was much emaciated. Recovery was prompt 
and animal gained in weight. He died six months after 
the operation. Postmortem examination showed no 
evidence of tumor at the sight of operation (macro- 
scopically or microscopically) but there were metastases 
in the lung. These tumors are comparatively rare in 
man but quite frequent in lower animals. Krompecher, 
1900, first adequately described this group of epidermal 
tumors which maintain the character of the basal cells. 
He traced their origin to the basal cells of the Mal- 
pighian layer of the skin. Those arising from the fol- 
licles usually have an adenoid form. The point of most 
interest in this case is the lung metastases as this tumor 
only occasionally metastasizes. 
Barred Owl (Strix varia) 9. Papillary adenoma of 
pancreatic ducts. 
Malaccan Porcupine (Hystric longicauda) 9 . Scirrhus 
carcinoma of mammary gland with metastases to lung, 
liver, spleen and kidney 
Gray Wolf (Canis vulpes) 9. Carcinoma of thyroid. 
The right thyroid measures 7x2x2 cm., the left 
7.5 x 2.5 x 2 cm. These measurements indicate consid- 
erable enlargement in sausage-like shape. Dull purple, 
indefinitely lobulated, prominent superficial veins. Soft 
resilient. Section surface is lobular, purple, bloody, 
not cystic but with large veins. In the superior anterior 
mediastinum is a deeply red, soft, resilient mass spread 
over the veins, which may be thymus or intrathoracic 
thyroid. 
Microscopic section of thyroid shows deeply staining 
very cellular mass roughly arranged in areas by dis- 
